caif: Bugfix - Increase default headroom size for control channel.
[linux-2.6.git] / net / caif / cfsrvl.c
1 /*
2  * Copyright (C) ST-Ericsson AB 2010
3  * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
4  * License terms: GNU General Public License (GPL) version 2
5  */
6
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/errno.h>
10 #include <linux/slab.h>
11 #include <net/caif/caif_layer.h>
12 #include <net/caif/cfsrvl.h>
13 #include <net/caif/cfpkt.h>
14
15 #define SRVL_CTRL_PKT_SIZE 1
16 #define SRVL_FLOW_OFF 0x81
17 #define SRVL_FLOW_ON  0x80
18 #define SRVL_SET_PIN  0x82
19 #define SRVL_CTRL_PKT_SIZE 1
20
21 #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
22
23 static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
24                                 int phyid)
25 {
26         struct cfsrvl *service = container_obj(layr);
27
28         caif_assert(layr->up != NULL);
29         caif_assert(layr->up->ctrlcmd != NULL);
30
31         switch (ctrl) {
32         case CAIF_CTRLCMD_INIT_RSP:
33                 service->open = true;
34                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
35                 break;
36         case CAIF_CTRLCMD_DEINIT_RSP:
37         case CAIF_CTRLCMD_INIT_FAIL_RSP:
38                 service->open = false;
39                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
40                 break;
41         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
42                 if (phyid != service->dev_info.id)
43                         break;
44                 if (service->modem_flow_on)
45                         layr->up->ctrlcmd(layr->up,
46                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
47                 service->phy_flow_on = false;
48                 break;
49         case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
50                 if (phyid != service->dev_info.id)
51                         return;
52                 if (service->modem_flow_on) {
53                         layr->up->ctrlcmd(layr->up,
54                                            CAIF_CTRLCMD_FLOW_ON_IND,
55                                            phyid);
56                 }
57                 service->phy_flow_on = true;
58                 break;
59         case CAIF_CTRLCMD_FLOW_OFF_IND:
60                 if (service->phy_flow_on) {
61                         layr->up->ctrlcmd(layr->up,
62                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
63                 }
64                 service->modem_flow_on = false;
65                 break;
66         case CAIF_CTRLCMD_FLOW_ON_IND:
67                 if (service->phy_flow_on) {
68                         layr->up->ctrlcmd(layr->up,
69                                           CAIF_CTRLCMD_FLOW_ON_IND, phyid);
70                 }
71                 service->modem_flow_on = true;
72                 break;
73         case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
74                 /* In case interface is down, let's fake a remove shutdown */
75                 layr->up->ctrlcmd(layr->up,
76                                 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
77                 break;
78         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
79                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
80                 break;
81         default:
82                 pr_warning("CAIF: %s(): "
83                            "Unexpected ctrl in cfsrvl (%d)\n", __func__, ctrl);
84                 /* We have both modem and phy flow on, send flow on */
85                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
86                 service->phy_flow_on = true;
87                 break;
88         }
89 }
90
91 static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
92 {
93         struct cfsrvl *service = container_obj(layr);
94
95         caif_assert(layr != NULL);
96         caif_assert(layr->dn != NULL);
97         caif_assert(layr->dn->transmit != NULL);
98
99         if (!service->supports_flowctrl)
100                 return 0;
101
102         switch (ctrl) {
103         case CAIF_MODEMCMD_FLOW_ON_REQ:
104                 {
105                         struct cfpkt *pkt;
106                         struct caif_payload_info *info;
107                         u8 flow_on = SRVL_FLOW_ON;
108                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
109                         if (!pkt) {
110                                 pr_warning("CAIF: %s(): Out of memory\n",
111                                         __func__);
112                                 return -ENOMEM;
113                         }
114
115                         if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
116                                 pr_err("CAIF: %s(): Packet is erroneous!\n",
117                                         __func__);
118                                 cfpkt_destroy(pkt);
119                                 return -EPROTO;
120                         }
121                         info = cfpkt_info(pkt);
122                         info->channel_id = service->layer.id;
123                         info->hdr_len = 1;
124                         info->dev_info = &service->dev_info;
125                         return layr->dn->transmit(layr->dn, pkt);
126                 }
127         case CAIF_MODEMCMD_FLOW_OFF_REQ:
128                 {
129                         struct cfpkt *pkt;
130                         struct caif_payload_info *info;
131                         u8 flow_off = SRVL_FLOW_OFF;
132                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
133                         if (!pkt) {
134                                 pr_warning("CAIF: %s(): Out of memory\n",
135                                         __func__);
136                                 return -ENOMEM;
137                         }
138
139                         if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
140                                 pr_err("CAIF: %s(): Packet is erroneous!\n",
141                                         __func__);
142                                 cfpkt_destroy(pkt);
143                                 return -EPROTO;
144                         }
145                         info = cfpkt_info(pkt);
146                         info->channel_id = service->layer.id;
147                         info->hdr_len = 1;
148                         info->dev_info = &service->dev_info;
149                         return layr->dn->transmit(layr->dn, pkt);
150                 }
151         default:
152           break;
153         }
154         return -EINVAL;
155 }
156
157 void cfservl_destroy(struct cflayer *layer)
158 {
159         kfree(layer);
160 }
161
162 void cfsrvl_release(struct kref *kref)
163 {
164         struct cfsrvl *service = container_of(kref, struct cfsrvl, ref);
165         kfree(service);
166 }
167
168 void cfsrvl_init(struct cfsrvl *service,
169                         u8 channel_id,
170                         struct dev_info *dev_info,
171                         bool supports_flowctrl
172                         )
173 {
174         caif_assert(offsetof(struct cfsrvl, layer) == 0);
175         service->open = false;
176         service->modem_flow_on = true;
177         service->phy_flow_on = true;
178         service->layer.id = channel_id;
179         service->layer.ctrlcmd = cfservl_ctrlcmd;
180         service->layer.modemcmd = cfservl_modemcmd;
181         service->dev_info = *dev_info;
182         service->supports_flowctrl = supports_flowctrl;
183         service->release = cfsrvl_release;
184         kref_init(&service->ref);
185 }
186
187
188 bool cfsrvl_ready(struct cfsrvl *service, int *err)
189 {
190         if (service->open && service->modem_flow_on && service->phy_flow_on)
191                 return true;
192         if (!service->open) {
193                 *err = -ENOTCONN;
194                 return false;
195         }
196         caif_assert(!(service->modem_flow_on && service->phy_flow_on));
197         *err = -EAGAIN;
198         return false;
199 }
200 u8 cfsrvl_getphyid(struct cflayer *layer)
201 {
202         struct cfsrvl *servl = container_obj(layer);
203         return servl->dev_info.id;
204 }
205
206 bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
207 {
208         struct cfsrvl *servl = container_obj(layer);
209         return servl->dev_info.id == phyid;
210 }